Keratin 16-null mice develop palmoplantar keratoderma, a hallmark feature of pachyonychia congenita and related disorders.

Keratin 16-null mice develop palmoplantar keratoderma, a hallmark feature of pachyonychia congenita and related disorders.
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DOI:
10.1038/jid.2012.6
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发表时间:
2012-05
影响因子:
6.5
通讯作者:
Coulombe, Pierre A.
Coulombe, Pierre A.
中科院分区:
医学1区
文献类型:
--
作者:
Lessard, Juliane C.;Coulombe, Pierre A.

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角蛋白16(KRT16在人,Krt16在小鼠)是一种I型中间丝蛋白,在上皮性附件中结构性表达,并在创伤和其他应激条件下在表皮中诱导表达。KRT16编码序列的突变会引起先天性肥厚性甲病(PC),这是一种罕见的常染色体显性遗传病,以肥厚性指甲营养不良、口腔白质角化病和掌跖角化病(PPK)为特征。与PC相关的PPK是极其痛苦的,损害了患者的行动能力,使他们成为PC最虚弱的症状。在这项研究中,我们表明,尽管Krt16基因以隐性方式遗传,但在小鼠中,Krt16基因的失活一直会导致口腔病变以及Krt16−/−前爪和后爪上类似PPK的角化性愈伤组织,这严重损害了动物的行走能力。我们的发现质疑了与PC相关的PPK仅作为主要作用于突变角蛋白的功能获得的观点,并强调了修饰物在PC症状临床异质性中的关键作用。
Keratin 16 (KRT16 in human, Krt16 in mouse), a type I intermediate filament protein, is constitutively expressed in epithelial appendages and is induced in the epidermis upon wounding and other stressors. Mutations altering the coding sequence of KRT16 cause Pachyonychia Congenita (PC), a rare autosomal dominant disorder characterized by hypertrophic nail dystrophy, oral leukokeratosis, and palmoplantar keratoderma (PPK). PPK associated with PC are extremely painful and compromise patient mobility, making them the most debilitating PC symptom. In this study, we show that, although inherited in a recessive fashion, the inactivation of Krt16 in mice consistently causes oral lesions as well as PPK-like hyperkeratotic calluses on Krt16−/− front and hind paws, which severely compromise the animals’ ability to walk. Our findings call into question the view that PC-related PPK arise exclusively as a gain-of-function on the account of dominantly acting mutated keratins, and highlight the key role of modifiers in the clinical heterogeneity of PC symptoms.
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